package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.StrUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;


public class SimpleRedisLock implements ILock{

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString()+"-";
    private static final DefaultRedisScript<Long> UN_LOCK_SCRIPT;
    static {
        UN_LOCK_SCRIPT = new DefaultRedisScript<>();
        UN_LOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UN_LOCK_SCRIPT.setResultType(Long.class);
    }


    @Override
    public boolean trylock(long timeoutSec) {
        String key = KEY_PREFIX + name;
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(key, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);

    }

    @Override
    public void unlock() {
        String key = KEY_PREFIX + name;
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        stringRedisTemplate.execute(UN_LOCK_SCRIPT, Collections.singletonList(key),threadId);
    }

    //    @Override
//    public void unlock() {
//        String key = KEY_PREFIX + name;
//
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//
//        String id = stringRedisTemplate.opsForValue().get(key);
//        if(threadId.equals(id)){
//            stringRedisTemplate.delete(key);
//        }
//
//
//    }
}
